Modified Johnson-Cook description of wide temperature and strain rate measurements made on a nickel-base superalloy

Wang, Jianjun; Guo, Weiguo; Li, Penghui; Zhou, Ping

doi:10.1080/09603409.2016.1252164

Cited by 22 publications

(12 citation statements)

References 39 publications

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“…Some constitutive models are frequently used in modeling of steels, for example, the Johnson-Cook model [ 20 ], the Zerilli-Armstrong model [ 21 ], the artificial neural network model [ 22 ], the dislocation based model [ 4 ], the damage based model [ 8 ], etc. In the present investigation, the modified Arrhenius model was chosen to establish the stress ( σ ) and strain ( ε ) relation under various strain rates (

) and temperatures ( T ) because of the advantage in convenience and accuracy.…”

Section: Resultsmentioning

confidence: 99%

A Flow Stress Model of 300M Steel for Isothermal Tension

et al. 2021

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To investigate the effect of hot working parameters on the flow behavior of 300M steel under tension, hot uniaxial tensile tests were implemented under different temperatures (950 °C, 1000 °C, 1050 °C, 1100 °C, 1150 °C) and strain rates (0.01 s−1, 0.1 s−1, 1 s−1, 10 s−1). Compared with uniaxial compression, the tensile flow stress was 29.1% higher because dynamic recrystallization softening was less sufficient in the tensile stress state. The ultimate elongation of 300M steel increased with the decrease of temperature and the increase of strain rate. To eliminate the influence of sample necking on stress-strain relationship, both the stress and the strain were calibrated using the cross-sectional area of the neck zone. A constitutive model for tensile deformation was established based on the modified Arrhenius model, in which the model parameters (n, α, Q, ln(A)) were described as a function of strain. The average deviation was 6.81 MPa (6.23%), showing good accuracy of the constitutive model.

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) and temperatures ( T ) because of the advantage in convenience and accuracy.…”

Section: Resultsmentioning

confidence: 99%

A Flow Stress Model of 300M Steel for Isothermal Tension

et al. 2021

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“…For the quasi‐static experiments, the deformation of the specimen is obtained indirectly by subtracting the displacement due to the compliance of the loading frame from the displacement measured by Linear Variable Differential Transformer (LVDT), mounted on the testing machine. Dynamic experiments at strain rates of 5000/s, 10,000/s, and 15,000/s are conducted using the Split Hopkinson Pressure Bar (SHPB) . Figure shows the schematic of the SHPB, in which the diameters of strike bar, incident bar, and transmit bar are all 12.7 mm (half inch) in this study.…”

Section: Methodsmentioning

confidence: 99%

A bilinear constitutive response for polyureas as a function of temperature, strain rate and pressure

Zhang

Wang

Guo

et al. 2017

J of Applied Polymer Sci

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Polyurea is widely applied as a coating material to increase the survivability of structures under impact loading. In this study, a systematic experimental program about the stress-strain behaviors of two polyaspartic esters polyureas is conducted over the temperature range of 233 K-293 K and strain rate range of 0.001/s-15,000/s, including the high-pressure effects on the response of the polyureas. Based on the experimental results, the effects of temperature, strain rate, and pressure on the stress-strain behaviors are analyzed, the mechanical properties of the two polyureas are compared. The temperature and strain rate dependences of the Young's modulus, yield stress, and strain hardening slope are modeled. Finally, a bilinear constitutive model is proposed to describe the temperature, strain rate, and pressure dependences of the stress-strain behaviors. The model predictions, which agree well with the experimental results, provide basis for the application of the two polyureas.

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“…According to the JC model, the yield stress increases linearly with the increase in

. The yield stress of many other ductile metals also shows a huge increase when the strain rate exceeds 10 2 s −1 or 10 3 s −1 [ 40 , 41 , 42 ]. Therefore, the original JC model (Equation (9)) cannot describe the dependence of yield stress on the strain rate, as shown in Figure 5 .…”

Section: Materials Model and Parameter Determinationmentioning

confidence: 99%

Study on Intrinsic Influence Law of Specimen Size and Loading Speed on Charpy Impact Test

Wang

Zhang

et al. 2022

Materials

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Charpy impact energy/impact toughness is closely related to external factors such as specimen size. However, when the sample size is small, the linear conversion relationship between the Charpy impact energy of the sub-size and full-size Charpy specimens does not hold; the Charpy impact toughness varies with the size of the specimen and other factors. This indicates that studying the internal influence of external factors on impact energy or impact toughness is the key to accurately understanding and evaluating the toughness and brittleness of materials. In this paper, the effects of strain rate on the flow behavior and the effects of stress triaxiality on the fracture behavior of 30CrMnSiNi2A high-strength steel were investigated using quasi-static smooth bar and notched bar uniaxial tensile tests and Split Hopkinson Tensile Bar (SHTP). Based on the flow behavior and strain rate dependences of the yield behavior, a modified JC model was established to describe the flow behavior and strain rate behavior. Charpy impact tests were simulated using the modified JC model and JC failure model with the determined parameters. Reasonable agreements between the simulation and experimental results have been achieved, and the validity of the model was proved. According to the simulation results, the impact energy was divided into crack initiation energy, crack stability propagation energy and crack instability propagation energy. On this basis, the effects of striker velocity and specimen width on the energy and characteristic load of each part were studied. The results show that each part of the impact energy has a negligible dependence on the hammer velocity, but there is a significantly different positive linear relationship with the width of the sample. The energy increment of each part also showed an inverse correlation with the increase in the sample width. The findings reveal that the internal mechanism of Charpy impact toughness decreases with the increase in sample width; to a certain extent, it also reveals the internal reason why the linear transformation relationship of Charpy impact energy between sub-size specimens and standard specimens is not established when the specimens are small. The analytical method and results presented in this paper can provide a reference for the study of the dynamic behavior of high-strength steel, the relationship between material properties and sample size, and the elastic–plastic impact dynamic design.

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Modified Johnson-Cook description of wide temperature and strain rate measurements made on a nickel-base superalloy

Cited by 22 publications

References 39 publications

A Flow Stress Model of 300M Steel for Isothermal Tension

A Flow Stress Model of 300M Steel for Isothermal Tension

A bilinear constitutive response for polyureas as a function of temperature, strain rate and pressure

Study on Intrinsic Influence Law of Specimen Size and Loading Speed on Charpy Impact Test

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